ML20087G424
| ML20087G424 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 03/13/1984 |
| From: | Schroeder C COMMONWEALTH EDISON CO. |
| To: | Harold Denton Office of Nuclear Reactor Regulation |
| References | |
| 8266N, NUDOCS 8403200013 | |
| Download: ML20087G424 (2) | |
Text
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'N Commonwealth Edison O
.) one First National Ptara. Chicago. Illinois O' 7 Address R ply to: Post Office Box 767 gQ Chicago, Illinois 60690 March 13, 1984 Mr. Harold R. Denton, Director Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission Washington, DC 20555
Subject:
LaSalle County Station, Units 1 and 2 RHR and RCIC High/ Low Pressure Interface Valve 2E12-F051A NRC Docket Nos. 50-373 and 50-374 Reference (a):
C.W. Schroeder letter to H. R. Denton I
dated March 1, 1984 I
Dear Mr. Denton:
The following documents the telephone conference of March 8, 1984, between Dr. A. Bournia, et al, of the Nuclear Regulatory Commission and C. W. Schroeder, et al, of Commonwealth Edison Company with regard to RHR and RCIC high/ low pressure interface boundary as presented in Reference (a).
The NRC Staff questioned the possibility of inadvertent full l
opening of valve 2E12-F051A with rated reactor pressure applied to one side and the resultant effect on the low pressure piping downstream.
l CECO indicated that a full open on valve 2E12-F051A would result l
l in no detrimental effect on the low pressure piping because:
l l
1.
The type valve used for 2E12-F051A is similar in design to a DRAG valve.
This type valve is constructed such that it reduces the pressure across the open valve to a value of less than the design value of the piping downstream.
2.
Should the piping pressure be exceeded, relief valve 2E12-F055A will open and discharge steam to the suppression pool at a rate of approx. 186,000 lb./ min.
3.
This value is below the design value of 300,000 lb./ min.
of RCIC makeup.
8403200013 840313 PDR ADOCK 05000373 P
PDR gl ll0
J H. R. Denton March 13, 1984 To the best of my knowledge and belief the statements contained herein are true and correct.
In some respects these statements are not based on my personal knowledge but upon information furnished by other Commonwealth Edison and contractor employees.
Such information has been reviewed in accordance with Company practice and I believe it to be reliable.
Should you have questions concerning the above, please contact this office.
Enclosed for your use are one signed original and forty (40) copies of this letter.
Very truly yours, Sfl3f$
C. W. Schroeder Nuclear Licensing Administrator 1m cc:
NRC Resident Inspector - LSCS Dr. A. Bournia - Telecopy J
8266N 1
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